To put it simply and in religious terms... because God gave everyone free will. God doesn't control people, and people make mistakes.

"I don't care about politics"

Then politics doesn't care about you either. Truth. You've got to make your voice heard, if you want to be listened to. But that's too logical for some people, so let me go a step further. Not making your voice heard, leaves other people free to hijack it by speaking on your behalf, even if they don't actually give a shit about you. That's politics. So, make your voice heard. That's not a quote from anywhere. That's just me.﻿